/*

 * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package nsk.jdwp.ArrayReference.Length;

import java.io.*;

import nsk.share.*;

import nsk.share.jpda.*;

import nsk.share.jdwp.*;

/**

 * Test for JDWP command: ArrayReference.Length.

 *

 * See length001.README for description of test execution.

 *

 * Test is executed by invoking method runIt().

 * JDWP command is tested in method testCommand().

 *

 * @see #runIt()

 * @see #testCommand()

 */

public class length001 {

    // exit status constants

    static final int JCK_STATUS_BASE = 95;

    static final int PASSED = 0;

    static final int FAILED = 2;

    // communication signals constants

    static final String READY = "ready";

    static final String QUIT = "quit";

    // package and classes names constants

    static final String PACKAGE_NAME = "nsk.jdwp.ArrayReference.Length";

    static final String TEST_CLASS_NAME = PACKAGE_NAME + "." + "length001";

    static final String DEBUGEE_CLASS_NAME = TEST_CLASS_NAME + "a";

    // tested JDWP command constants

    static final String JDWP_COMMAND_NAME = "ArrayReference.Length";

    static final int JDWP_COMMAND_ID = JDWP.Command.ArrayReference.Length;

    // tested class name and signature constants

    static final String TESTED_CLASS_NAME = DEBUGEE_CLASS_NAME + "$" + "TestedClass";

    static final String TESTED_CLASS_SIGNATURE = "L" + TESTED_CLASS_NAME.replace('.', '/') + ";";

    // name of the static field in the tested class with the tested object value

    static final String ARRAY_FIELD_NAME = length001a.ARRAY_FIELD_NAME;

    static final int ARRAY_LENGTH = length001a.ARRAY_LENGTH;

    // usual scaffold objects

    ArgumentHandler argumentHandler = null;

    Log log = null;

    Binder binder = null;

    Debugee debugee = null;

    Transport transport = null;

    IOPipe pipe = null;

    // test passed or not

    boolean success = true;

    // -------------------------------------------------------------------

    /**

     * Start test from command line.

     */

    public static void main (String argv[]) {

        System.exit(run(argv,System.out) + JCK_STATUS_BASE);

    }

    /**

     * Start JCK-compilant test.

     */

    public static int run(String argv[], PrintStream out) {

        return new length001().runIt(argv, out);

    }

    // -------------------------------------------------------------------

    /**

     * Perform test execution.

     */

    public int runIt(String argv[], PrintStream out) {

        // make log for debugger messages

        argumentHandler = new ArgumentHandler(argv);

        log = new Log(out, argumentHandler);

        // execute test and display results

        try {

            log.display("\n>>> Preparing debugee for testing \n");

            // launch debugee

            binder = new Binder(argumentHandler, log);

            log.display("Launching debugee");

            debugee = binder.bindToDebugee(DEBUGEE_CLASS_NAME);

            transport = debugee.getTransport();

            pipe = debugee.createIOPipe();

            // make debuggee ready for testing

            prepareDebugee();

            // work with prepared debugee

            try {

                log.display("\n>>> Obtaining requred data from debugee \n");

                // query debugee for TypeID of tested class

                log.display("Getting ReferenceTypeID by signature:\n"

                            + "  " + TESTED_CLASS_SIGNATURE);

                long classID = debugee.getReferenceTypeID(TESTED_CLASS_SIGNATURE);

                log.display("  got classID: " + classID);

                // query debuggee for arrayID value from static field

                log.display("Getting arrayID value from static field: "

                            + ARRAY_FIELD_NAME);

                long arrayID = queryObjectID(classID,

                            ARRAY_FIELD_NAME, JDWP.Tag.ARRAY);

                log.display("  got arrayID: " + arrayID);

                // perform testing JDWP command

                log.display("\n>>> Testing JDWP command \n");

                testCommand(arrayID);

            } finally {

                // quit debugee

                log.display("\n>>> Finishing test \n");

                quitDebugee();

            }

        } catch (Failure e) {

            log.complain("TEST FAILED: " + e.getMessage());

            e.printStackTrace(out);

            success = false;

        } catch (Exception e) {

            log.complain("Caught unexpected exception:\n" + e);

            e.printStackTrace(out);

            success = false;

        }

        if (!success) {

            log.complain("TEST FAILED");

            return FAILED;

        }

        out.println("TEST PASSED");

        return PASSED;

    }

    /**

     * Prepare debugee for testing and waiting for ready signal.

     */

    void prepareDebugee() {

        // wait for VM_INIT event from debugee

        log.display("Waiting for VM_INIT event");

        debugee.waitForVMInit();

        // query debugee for VM-dependent ID sizes

        log.display("Querying for IDSizes");

        debugee.queryForIDSizes();

        // resume initially suspended debugee

        log.display("Resuming debugee VM");

        debugee.resume();

        // wait for READY signal from debugee

        log.display("Waiting for signal from debugee: " + READY);

        String signal = pipe.readln();

        log.display("Received signal from debugee: " + signal);

        if (! signal.equals(READY)) {

            throw new TestBug("Unexpected signal received form debugee: " + signal

                            + " (expected: " + READY + ")");

        }

    }

    /**

     * Sending debugee signal to quit and waiting for it exits.

     */

    void quitDebugee() {

        // send debugee signal to quit

        log.display("Sending signal to debugee: " + QUIT);

        pipe.println(QUIT);

        // wait for debugee exits

        log.display("Waiting for debugee exits");

        int code = debugee.waitFor();

        // analize debugee exit status code

        if (code == JCK_STATUS_BASE + PASSED) {

            log.display("Debugee PASSED with exit code: " + code);

        } else {

            log.complain("Debugee FAILED with exit code: " + code);

            success = false;

        }

    }

    /**

     * Query debuggee for objectID value of static class field.

     */

    long queryObjectID(long classID, String fieldName, byte tag) {

        // get fieledID for static field (declared in the class)

        long fieldID = debugee.getClassFieldID(classID, fieldName, true);

        // get value of the field

        JDWP.Value value = debugee.getStaticFieldValue(classID, fieldID);

        // check that value has THREAD tag

        if (value.getTag() != tag) {

            throw new Failure("Wrong objectID tag received from field \"" + fieldName

                            + "\": " + value.getTag() + " (expected: " + tag + ")");

        }

        // extract threadID from the value

        long objectID = ((Long)value.getValue()).longValue();

        return objectID;

    }

    /**

     * Perform testing JDWP command for specified arrayID.

     */

    void testCommand(long arrayID) {

        // create command packet

        log.display("Create command packet:");

        log.display("Command: " + JDWP_COMMAND_NAME);

        CommandPacket command = new CommandPacket(JDWP_COMMAND_ID);

        // add out data to the command packet

        log.display("  arrayID: " + arrayID);

        command.addObjectID(arrayID);

        command.setLength();

        // send command packet to debugee

        try {

            log.display("Sending command packet:\n" + command);

            transport.write(command);

        } catch (IOException e) {

            log.complain("Unable to send command packet:\n" + e);

            success = false;

            return;

        }

        ReplyPacket reply = new ReplyPacket();

        // receive reply packet from debugee

        try {

            log.display("Waiting for reply packet");

            transport.read(reply);

            log.display("Reply packet received:\n" + reply);

        } catch (IOException e) {

            log.complain("Unable to read reply packet:\n" + e);

            success = false;

            return;

        }

        // check reply packet header

        try{

            log.display("Checking reply packet header");

            reply.checkHeader(command.getPacketID());

        } catch (BoundException e) {

            log.complain("Bad header of reply packet: " + e.getMessage());

            success = false;

        }

        // start parsing reply packet data

        log.display("Parsing reply packet:");

        reply.resetPosition();

        // extract array length

        int arrayLength = 0;

        try {

            arrayLength = reply.getInt();

            log.display("  arrayLength: " + arrayLength);

        } catch (BoundException e) {

            log.complain("Unable to extract arrayLength from reply packet:\n\t"

                        + e.getMessage());

            success = false;

        }

        // check if arrayLength is as expected

        if (arrayLength < 0) {

            log.complain("Negative number of arrayLength received:" + arrayLength

                        + " (expected: " + ARRAY_LENGTH + ")");

            success = false;

        } else if (arrayLength != ARRAY_LENGTH) {

            log.complain("Unexpected number of values received:" + arrayLength

                        + " (expected: " + ARRAY_LENGTH + ")");

            success = false;

        }

        // check for extra data in reply packet

        if (! reply.isParsed()) {

            log.complain("Extra trailing bytes found in reply packet at: "

                        + "0x" + reply.toHexString(reply.currentDataPosition(), 4));

            success = false;

        }

    }

}